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Rutaceae: A plant family in the order Sapindales that grows in warmer regions and has conspicuous flowers.Ruta: A plant genus of the family RUTACEAE. Members contain quinoline alkaloids.Zanthoxylum: A plant genus of the family RUTACEAE. Some members of Zanthoxylum are reclassified from ELEUTHEROCOCCUS, Melicope, and EVODIA. The twigs are used as dental brushing sticks (TOOTHBRUSHING). Most plants that are called Fagara have been reclassified as Zanthoxylum, however some Fagara were reclassified to MELICOPE (also in the Rutacea family) or to GLEDITSIA (a genus in the FABACEAE family).Genes, Chloroplast: Those nucleic acid sequences that function as units of heredity which are located within the CHLOROPLAST DNA.Evodia: A plant genus of the family RUTACEAE which is used in Chinese medicine (DRUGS, CHINESE HERBAL). Evodiamine and other quinazoline alkaloids (QUINAZOLINES) are obtained from the fruit of E. ruticarpa.Citrus: A plant genus of the family RUTACEAE. They bear the familiar citrus fruits including oranges, grapefruit, lemons, and limes. There are many hybrids which makes the nomenclature confusing.Plant Stems: Parts of plants that usually grow vertically upwards towards the light and support the leaves, buds, and reproductive structures. (From Concise Dictionary of Biology, 1990)Plant Extracts: Concentrated pharmaceutical preparations of plants obtained by removing active constituents with a suitable solvent, which is evaporated away, and adjusting the residue to a prescribed standard.Alkaloids: Organic nitrogenous bases. Many alkaloids of medical importance occur in the animal and vegetable kingdoms, and some have been synthesized. (Grant & Hackh's Chemical Dictionary, 5th ed)Plants, Medicinal: Plants whose roots, leaves, seeds, bark, or other constituent parts possess therapeutic, tonic, purgative, curative or other pharmacologic attributes, when administered to man or animals.